/**
 * The MIT License (MIT)
 * <p>
 * Copyright (c) 2020 Thomas Cashman
 * <p>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p>
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * <p>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.mini2Dx.miniscript.core;

import java.util.ArrayDeque;

public abstract class SynchronizedObjectPool<T> {
	private final ArrayDeque<T> POOL = new ArrayDeque<T>();

	protected abstract T construct();

	public T allocate() {
		T result = null;
		synchronized (POOL) {
			if(!POOL.isEmpty()) {
				result = POOL.removeFirst();
			}
		}
		if(result == null) {
			result = construct();
		}
		return result;
	}

	public void release(T t) {
		synchronized (POOL) {
			POOL.addLast(t);
		}
	}
}
